Lesson 1Deadbolt types and dimensions: single-throw vs double-throw, bolt materials and typical diametersLooks at deadbolt designs for steel doors, comparing single-throw and double-throw types. Goes over bolt materials, sizes, throw distance, latch guards, and matching with locks, strikes, and security standards.
Single-throw vs double-throw mechanismsBolt materials, hardness, and corrosionBolt diameter, throw length, and clearancesStrike plates, boxes, and reinforcementCompatibility with cylinders and escutcheonsLesson 2Corrosion protection options: galvanizing, paint systems, powder coat, surface prep standardsExplains how rust attacks steel doors, then compares galvanizing, liquid paint, and powder coating. Covers cleaning standards, coating thickness, checks, and picking protection to suit the place and how long it lasts.
Atmospheric corrosion and exposure categoriesHot-dip galvanizing vs electro-galvanizingLiquid paint systems and zinc-rich primersPowder coating process and curing controlSurface prep grades per ISO and SSPCLesson 3Hinges and pivot hardware for high-use doors: butt hinges, continuous hinges, pin types, security hinge optionsChecks out hinge and pivot choices for busy steel doors. Compares butt and continuous hinges, pivot sets, pin and bearing types, security bits, and sizing by door weight, how often used, and fire or escape rules.
Butt hinge types, knuckle count, and sizingContinuous hinges for high-cycle applicationsFloor and top pivots for heavy doorsSecurity hinges, studs, and non-removable pinsBearing types, lubrication, and maintenanceLesson 4Fasteners and anchors to concrete: mechanical anchors, chemical anchors, anchor sizing and embedment depthsDescribes mechanical and chemical anchors for fixing steel frames to concrete. Covers checking the base, anchor sizes, depth in, edge distances, load paths, and fixing ways to stop loosening or cracking.
Concrete strength, cracking, and inspectionExpansion anchors and sleeve anchorsAdhesive anchors and curing conditionsEmbedment depth, spacing, and edge distanceTorque, installation, and pull-out testingLesson 5Standard steel profiles: rectangular tube, square tube, angle irons, flat bars—dimensions, wall thicknesses, and use casesDetails common hollow and solid steel shapes used in door frames, stiffeners, and strengthening. Reviews size ranges, wall thickness, tolerances, and how shape choice affects strength, weight, and making effort.
Rectangular and square hollow section rangesAngle irons for frames and edge stiffenersFlat bars for strike, hinge, and lock platesWall thickness vs load and weld distortionSpecifying tolerances and mill certificatesLesson 6Materials selection checklist for warehouse entrance doors (weight, security rating, cost)Gives a handy checklist for choosing materials for warehouse entrance doors. Balances weight, security level, rust resistance, fire and exit needs, fittings match, and total fitting and long-term cost.
Door leaf gauge, profiles, and reinforcementsFrame type, anchors, and substrate checksLocking, cylinders, and access controlCorrosion protection and environment classBudget, lifecycle cost, and maintenanceLesson 7Standard cylinder lock types for metal doors: euro-profile, rim cylinder, tubular, mortise cylinders—dimensions and backsetCovers main cylinder types used in metal doors, like euro-profile, rim, tubular, and mortise. Explains size standards, backset, cam types, keying choices, and match with multi-point and panic fittings.
Euro-profile cylinder dimensions and camsRim cylinders for surface-mounted locksTubular cylinders and keyway optionsMortise cylinders and thread standardsBackset, center distance, and door prepLesson 8Sheet thickness selection for door leafs and frames: 1.5–6 mm ranges, tradeoffs between weight and securityGuides picking sheet thickness for door panels and frames from 1.5–6 mm. Talks stiffness, dent resistance, weight, hinge load, and security, including usual thicknesses for factory, fire, and high-security doors.
Typical gauge ranges for leaves and framesDeflection, dent resistance, and span limitsWeight impact on hinges and closersSecurity, burglary, and fire rating needsCost and fabrication implications by gaugeLesson 9Common structural steels for doors: S235, S275, mild steel properties and selection criteriaIntroduces common steels for doors, like S235, S275, and mild steel types. Discusses yield strength, welding ease, toughness, coating behaviour, and picking types for frames, panels, and strengthening plates.
Mechanical properties of S235 and S275Mild steel chemistry and weldabilityFormability for bends, hems, and profilesCoating performance and galvanizing issuesSelecting grades for frames and stiffeners
